Total Bridges
2,542
Public highway bridges in New Hampshire
State profile · Near national median SD
New Hampshire bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in New Hampshire — drawn straight from the FHWA National Bridge Inventory.
- 2,542
- Public bridges
- 43.0%
- Good condition
- 7.1%
- Poor condition
- 7.1%
- Structurally deficient
Good Condition
43.0%
1,092 bridges rated 7-9
-7.0pp vs 50% benchmark
Poor Condition
7.1%
180 bridges rated 0-4
Structurally Deficient
7.1%
180 bridges flagged for repair priority
0.1pp vs national avg 7.0%
New Hampshire vs national bridge condition
New Hampshire — Good condition share 43.0%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
New Hampshire — Structurally deficient share 23.6%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)
New Hampshire vs nearby ranks
Adjacent states on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below New Hampshire on the same metric.
36
New York
6.90% top marginal rate
21
Kentucky
7.06% top marginal rate
33
New Hampshire
7.08% top marginal rate
40
Oklahoma
7.50% top marginal rate
35
New Mexico
7.61% top marginal rate
Bridges Needing Most Attention in New Hampshire
Six lowest-condition bridges in New Hampshire, ranked by composite NBI rating. Each is inspected at least every 24 months.
OLD DEERFIELD ROAD
PoorOver: BROOK
185 FT FROM NH RTE 43, Rockingham, NH
Built 1920 Load: 1.8 t ADT: 190
TEMPLETON TURNPIKE
Structurally DeficientOver: PRIEST BROOK
1.9MI. RTE 119, Cheshire, NH
Built 1984 Load: 2.7 t ADT: 86
DUDLEY ROAD
Structurally DeficientOver: LAMPREY RIVER
.23 MI JCT 101, Rockingham, NH
Built 1914 Load: 2.9 t ADT: 535
SHOP ROAD
Structurally DeficientOver: NEEDLE SHOP BROOK
0.8 MI N NEW CHESTER RD, Merrimack, NH
Built 1930 Load: 3.3 t ADT: 63
WHITCOMB MILLS RD
PoorOver: WHITE BROOK
0.06 MI FR ARCH ST, Cheshire, NH
Built 1940 Load: 3.6 t ADT: 814
LEIGHTON MEADOW RD
Structurally DeficientOver: PHILLIPS BROOK
100 FT FR SULLIVAN RD 61, Coos, NH
Built 1940 Load: 3.6 t ADT: 90
All Bridges in New Hampshire
I-93 NB
UnknownOver: MIRROR LAKE ROAD
0.24 MI THORNTON TL, Grafton, NH
Built 1970 ADT: 100
I-93 SB
UnknownOver: US 3,NHRR
1.72 MI THORNTON TL, Grafton, NH
Built 1970 ADT: 960
I-93 NB
UnknownOver: US 3,NHRR
1.72 MI THORNTON TL, Grafton, NH
Built 1970 ADT: 960
I-93 SB
UnknownOver: NH175
2.57 MI THORNTON TL, Grafton, NH
Built 1972 ADT: 450
I-93 NB
UnknownOver: NH175
2.57 MI THORNTON TL, Grafton, NH
Built 1972 ADT: 450
NH122,MAIN ST
UnknownOver: NH101
2.8 MI MILFORD TL, Hillsborough, NH
Built 1969 ADT: 13,000
NH101
UnknownOver: THORNTONS FERRY ROAD
2.3 MI MILFORD TL, Hillsborough, NH
Built 1971 ADT: 530
NH101
UnknownOver: BOSTON POST RD,BEAVER BK
1.56 MI MILFORD TL, Hillsborough, NH
Built 1969 ADT: 3,800
NH101
UnknownOver: NH122
1.3 MI MILFORD TL, Hillsborough, NH
Built 1969 ADT: 4,600
NH101
UnknownOver: MERRIMACK ROAD
0.7 MI MILFORD TL, Hillsborough, NH
Built 1969 ADT: 1,700
OLD BEDFORD ROAD
UnknownOver: NH114
0.4 MI JCT 101, Hillsborough, NH
Built 1964 ADT: 22,000
PLUMMER ROAD
UnknownOver: NH101
0.5 MI JCT RT 114, Hillsborough, NH
Built 1995 ADT: 36,200
I-293 SB OFF RAMP
UnknownOver: US 3
NH101/US3/I-293 Int'chg, Hillsborough, NH
Built 2006 ADT: 25,000
NH101 WB
UnknownOver: US 3
NH101 WB OVER US 3, Hillsborough, NH
Built 2006 ADT: 25,000
NH101 EB
UnknownOver: US 3
NH101 EB over US 3, Hillsborough, NH
Built 2006 ADT: 25,000
NH101 WB
UnknownOver: I-293(RAMP D)
.2 MI JCT RT 3, Hillsborough, NH
Built 1959 ADT: 13,000
NH101 WB
UnknownOver: FEE TPK
.3 MI JCT RT 3, Hillsborough, NH
Built 1993 ADT: 46,000
I-293 EB,NH101 EB
UnknownOver: FEE TPK
.3 MI E JCT US 3, Hillsborough, NH
Built 1993 ADT: 45,232
US 3
UnknownOver: FEE TPK
0.4 MI JCT RT101, Hillsborough, NH
Built 2013 ADT: 45,232
FEE TPK
UnknownOver: WIECZOREK DR
1/4 MILE SOUTH FROM TOLL, Hillsborough, NH
Built 2010 ADT: 6,000
TOLL PLAZA ACCESS
UnknownOver: FEE TPK NB ON-RAMP
1/4 SOUTH OF PLAZA, Hillsborough, NH
Built 2010 ADT: 3,000
FEE TPK NB RAMP
UnknownOver: WIECZOREK DR RAMP
0.2 MILES WEST OF TPK, Hillsborough, NH
Built 2011 ADT: 2,000
WIECZOREK DR
UnknownOver: US 3
.4 M WEST OF I-93, Hillsborough, NH
Built 2011 ADT: 22,000
WIECZOREK DR
UnknownOver: MERRIMACK R,NH 3A,CSX
1 MILE WEST OF MHT, Hillsborough, NH
Built 2011 ADT: 8,500
NH 9
UnknownOver: BEARDS BROOK,BEARDS RD
NH 9 at Beards Brook, Hillsborough, NH
Built 2002 ADT: 460
NH 9
UnknownOver: US202
JCT NH 9/US202, Hillsborough, NH
Built 2001 ADT: 6,300
BIBLE HILL ROAD
UnknownOver: NH 9,RAMP A
NH 9 under Bible Hill Ro, Hillsborough, NH
Built 2000 ADT: 6,300
BIBLE HILL ROAD
UnknownOver: US202
Bible Hill Road / US202, Hillsborough, NH
Built 2000 ADT: 6,300
CENTER ROAD
UnknownOver: US202,NH 9
2.2MI W HENNIKER T/L, Hillsborough, NH
Built 2002 ADT: 8,400
OLD HENNIKER ROAD
UnknownOver: US202,NH 9
1.2MI W HENNIKER T/L, Hillsborough, NH
Built 2002 ADT: 13,000
US202,NH 9
UnknownOver: HENNIKER ST
0.8MI W HENNIKER T/L, Hillsborough, NH
Built 2002 ADT: 8,600
I-293,FEE TPK
UnknownOver: HACKETT HILL ROAD
.2MI S HOOKSETT T.L., Hillsborough, NH
Built 1956 ADT: 2,800
RIVER ROAD
UnknownOver: I-93
0.01 S HOOK-MANCH TL, Hillsborough, NH
Built 1975 ADT: 63,072
I-293,FEE TPK SB
UnknownOver: NH 3A
2.MI S HOOKSETT T.L., Hillsborough, NH
Built 1956 ADT: 18,000
I-293,FEE TPK NB
UnknownOver: NH 3A
2.MI S HOOKSETT T.L., Hillsborough, NH
Built 1957 ADT: 18,000
I-293,FEE TPK
UnknownOver: STARK WAY
1.9MI S HOOKSETT T.L., Hillsborough, NH
Built 1956 ADT: 200
NH 28A
UnknownOver: I-93
0.1 MI HOOKSETT TL, Hillsborough, NH
Built 1976 ADT: 69,000
SALMON STREET WB
UnknownOver: MERRIMACK RIVER,CSX,RD
.3MI W JCT US 3, Hillsborough, NH
Built 1970 ADT: 7,800
NORTH RAMP
UnknownOver: I-293,FEE TPK
.5MI FROM STARK LANE, Hillsborough, NH
Built 1957 ADT: 45,000
SALMON STREET EB
UnknownOver: MERRIMACK R,CSX,RD,RAMP
0.3MI W OF JCT RT 3, Hillsborough, NH
Built 1970 ADT: 7,500
SOUTH RAMP
UnknownOver: I-293,FEE TPK
AT AMOSKEAG INTERCHANGE, Hillsborough, NH
Built 1957 ADT: 54,000
NH101
UnknownOver: NH 28 BYPASS
.2 MI W. AUBURN T.L., Hillsborough, NH
Built 1961 ADT: 15,000
I-93 NB
UnknownOver: WELLINGTON ROAD
0.2 MI E JCT RTE 28, Hillsborough, NH
Built 1976 ADT: 14,000
KELLEY STREET
UnknownOver: PISCATAQUOG R,CSX,RD
0.3 MI E JCT RTE 114-A, Hillsborough, NH
Built 1973 ADT: 100
I-93 SB
UnknownOver: WELLINGTON ROAD
0.2 MI E JCT RTE 28, Hillsborough, NH
Built 1976 ADT: 14,000
BRIDGE STREET WB
UnknownOver: I-293,NH 3A,CSX,MERR R
0.4 MI FROM ELM ST INV#8, Hillsborough, NH
Built 1990 ADT: 82,000
BRIDGE STREET EB
UnknownOver: I-293,NH 3A,CSX,MERR R
0.4 MI FROM ELM ST INV#8, Hillsborough, NH
Built 1988 ADT: 82,000
NH101 WB
UnknownOver: I-93 SB OFF RAMP
AT STEVENS POND, Hillsborough, NH
Built 1961 ADT: 53,000
I-93 NB
UnknownOver: NH101 WB,SBE RAMP
0.05 MI N JCT BRIDGE ST, Hillsborough, NH
Built 1977 ADT: 27,000
I-93 SB
UnknownOver: BRIDGE STREET
1.2 MI W JCT NH28 BYP, Hillsborough, NH
Built 1977 ADT: 2,600
Showing 51-100 of 2,542 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |